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@uitrit tatr stent @fitta ALFRED OROSSLEY, OF BROOKLYN, NEW YORK. Letters Patent IVO. 72,458, dated ,December 24, 1867.

IMPRQVEMENT IN STEAM-:ENGINE GLOBE-VALITES.

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kTO ALL WHOM IT MAY GONCERN:

Be it known that I, ALFRED CnossLEY, of Brooklyn, Kings county, New York, have invented a new and improved Valve and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing, forming part of this specification. I

The drawing represents avertieal sectional-view of my invention.

This invention relate'sj to a new valve'for steam and water-pipes, and consists in such an arrangement of the parts,'th at the packing is below the screw-thread by which the stem is moved in the bonnet, so that the water will n ot come in contact with the screw-thread. The invention also. consists in the arrangement of a recessor chamber, within the upper part of the bonnet, around the valve-stem; said recess being above. the screw-thread. 4 I A -V v The object of not carrying the screw-thread in the bonnet tp the upper part of the bonnet, is vtopreventthe scraping ofthe upper sinooth portion Aof the valve-stem.' I

As the valve-stem is, especially for water-works, generally protected by electro-plating, and, as'the thin cont can be easily scratched olf by the action of the femalescrew thread in the bonnet, the screw-threndhas been made so short that it will not come in contact with the smooth part ofthe valve-stem. l v l By arranging the packing below the screw-thread, water and steam are excluded from the screw-thread, and the latter will therefore not be ground oii` byV impurities contained in the water o r liquid. In water-works, the thread is generally quickly worn, as sand andother impurities enter between the windings of the thread and destroy the same.

A represents asteam or water-pipe, having an elbow, B, and a valve-seat, C, as usual. D is the valve'stem, havinga screw-thread,`sa, formed around it at or neariits middle. E isthe bonnet, by which the upper end of; the elbow is closed. The bonnet'is perforated, to allow the passage of the valve-stem D.

A female-screw thread, b, is formed in the perforation-of the bonnet, corresponding with the thread -a on the stem D. The thread'b does `not extend to the upper end of the bonnet, but above it. The perforation of the bonnet is enlarged, forming a chamber, e, as shown. The smooth upper part of the stem cannot be scratched orvinjured by the screw-thread b, and its coat of electro-plating will remain intact. Below the screw-thread. 1J, the perforation4 ofthe bonnet is enlarged to receive a nut, d, which presses a leather or India-rubber washer, F, against a shoulder` in the bonnet, as shown. Water or steam is, by means of this packing F, excluded. from the innerpart ci' the bonnet, and consequently also from the screw-threads a and b, for purposes heretofore set forth. The lower end of the stem D is swivelled into a valve, G, and its upper end is provided with a suitable handle orhand-wheel, H.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The chamber c, in the upper part of the bonnet E, above the screw-thread, by which .the valve-stem is raised and lowered, so 'that thc smooth upper part of the valve-stem will not come in contact with the screwthread in the bonnet, substantially as herein described.

2. The arrangement of the packing F, bonnet E, and its recess c, whereby to exclude water or steam from the screw-thread in the interior of the bonnet, substantially as herein shown and described.

ALFRED CROSSLEY.

Witnesses:

WM. F. McNAMARA, ALEX. F. Renners. 

